What's your plan to get users? A large part of the success from other asset-sharing services is due to the fact that they initially chose a vertical (Airbnb: apartments, Getaround/RelayRides: cars) and made a small number of people in that vertical incredibly happy. Generalizing to "all things" has the advantage of making your target audience/market bigger, but also seriously risks making the average experience worse for a couple of reasons: (1) you're constrained to keeping the interface generic enough for "all things", and (2) by not targeting a vertical, demand/supply becomes much less targeted, meaning you need a large user base for the marketplace to be useful.